Of course in QHD, Eq. (REF ) is not the only term which matters. Integrating over nucleon loops
at nonzero density, there is an infinite series of terms in \(\omega _0\)  which are generated at \(n_B \ne 0\) ,
including those \(\sim \omega _0^2\) , \(\sim \omega _0^3\) , and so on. Similarly, the nucleon couples to the
\(\sigma \) , whose properties also change with \(n_B\) .
These effects have been computed to one loop order [1]}, [2]}, [3]}, but
even for strong \(g_\omega \) , do not dramatically alter the EoS.
